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Finding the Fourth Proportional to 502.40, 693.40 and 315.92

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Solution

The fourth proportional to 502.40, 693.40 and 315.92 is: 436.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    502.40 : 693.40 = 315.92 : x
  2. Step 2: Convert to fraction form
    502.40/693.40 = 315.92/x
  3. Step 3: Cross multiply
    502.40x = 693.40 × 315.92
  4. Step 4: Simplify right side
    502.40x = 219,059.04
  5. Step 5: Solve for x
    x = 219,059.04/502.40
  6. Step 6: Final answer
    x = 436.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.